export default {
  // 为当前模块开启命名空间
  namespaced: true,

  // 模块的 state 数据
  state: () => ({
    // 购物车的数组，用来存储购物车中每个商品的信息对象
    // 每个商品的信息对象，都包含如下 6 个属性：
    // { goods_id, goods_name, goods_price, goods_count, goods_small_logo, goods_state }
    cart:JSON.parse( uni.getStorageSync('cart') || '[]')
     }),

  // 模块的 mutations 方法
  mutations: {
    addToCart(state,goods){
    const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
   
    if(!findResult){
      state.cart.push(goods)
    }else {
      findResult.goods_count++
    }
   this.commit('m_cart/saveToStorage')
    },
    saveToStorage(state){
      uni.setStorageSync('cart',JSON.stringify(state.cart))
    },
    //更新购物车的勾选状态
    updateGoodsState(state,goods){
     const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
     if(findResult){
       findResult.goods_state = goods.goods_state
       this.commit('m_cart/saveToStorage')
     }
    },
    //更新商品的数量
    uodateGoodsCount(state,goods){
    const findResult = state.cart.find(x => x.goods_id === goods.goods_id )
    if(findResult){
      findResult.goods_count=goods.goods_count
      this.commit('m_cart/saveToStorage')
    }
    },
    removeGoodsById(state,goods_id){
   state.cart = state.cart.filter(x=>x.goods_id !== goods_id)
   this.commit('m_cart/saveToStorage')
    },
    updataAllGoods(state,newState){
      state.cart.forEach(x => x.goods_state = newState)
      this.commit('m_cart/saveToStorage')
    }
  },

  // 模块的 getters 属性
  getters: {
    //购物车所以商品的总数量
    total(state){
      // let c=0
      // state.cart.forEach(goods => c += goods.goods_count)
      // return c
     return state.cart.reduce((total, item) => total += item.goods_count, 0)
    },
    //购物车中已勾选商品的总数量
    checkedCount(state){
     return  state.cart.filter(x => x.goods_state).reduce((total,item) =>  total += item.goods_count, 0) 
    },
    //已勾选商品的价格
    checkedGoodsAmount(state){
     return state.cart.filter(x => x.goods_state).reduce((total,item) => total += item.goods_count * item.goods_price,0).toFixed(2)
      
    }
  },
}